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18167442 EB |
1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
2 | /* Compile this one with gcc. */ | |
658acbb2 | 3 | /* Copyright (C) 2004, 2005 Free Software Foundation, Inc. |
18167442 EB |
4 | |
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | /* As a special exception, if you link this library with other files, | |
23 | some of which are compiled with GCC, to produce an executable, | |
24 | this library does not by itself cause the resulting executable | |
25 | to be covered by the GNU General Public License. | |
26 | This exception does not however invalidate any other reasons why | |
27 | the executable file might be covered by the GNU General Public License. */ | |
28 | ||
29 | #ifndef GCC_GTHR_POSIX_H | |
30 | #define GCC_GTHR_POSIX_H | |
31 | ||
32 | /* POSIX threads specific definitions. | |
33 | Easy, since the interface is just one-to-one mapping. */ | |
34 | ||
35 | #define __GTHREADS 1 | |
36 | ||
37 | /* Some implementations of <pthread.h> require this to be defined. */ | |
38 | #ifndef _REENTRANT | |
39 | #define _REENTRANT 1 | |
40 | #endif | |
41 | ||
42 | #include <pthread.h> | |
43 | #include <unistd.h> | |
44 | ||
45 | typedef pthread_key_t __gthread_key_t; | |
46 | typedef pthread_once_t __gthread_once_t; | |
47 | typedef pthread_mutex_t __gthread_mutex_t; | |
48 | ||
49 | typedef struct { | |
50 | long depth; | |
51 | pthread_t owner; | |
52 | pthread_mutex_t actual; | |
53 | } __gthread_recursive_mutex_t; | |
54 | ||
55 | #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER | |
56 | #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT | |
57 | #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function | |
58 | ||
59 | #if SUPPORTS_WEAK && GTHREAD_USE_WEAK | |
60 | ||
61 | #pragma weak pthread_once | |
62 | #pragma weak pthread_key_create | |
63 | #pragma weak pthread_key_delete | |
64 | #pragma weak pthread_getspecific | |
65 | #pragma weak pthread_setspecific | |
66 | #pragma weak pthread_create | |
658acbb2 | 67 | #pragma weak pthread_cancel |
18167442 EB |
68 | #pragma weak pthread_self |
69 | ||
70 | #pragma weak pthread_mutex_lock | |
71 | #pragma weak pthread_mutex_trylock | |
72 | #pragma weak pthread_mutex_unlock | |
73 | #pragma weak pthread_mutexattr_init | |
74 | #pragma weak pthread_mutexattr_settype | |
75 | #pragma weak pthread_mutexattr_destroy | |
76 | ||
77 | #pragma weak pthread_mutex_init | |
78 | ||
79 | #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK) | |
80 | /* Objective-C. */ | |
81 | #pragma weak pthread_cond_broadcast | |
82 | #pragma weak pthread_cond_destroy | |
83 | #pragma weak pthread_cond_init | |
84 | #pragma weak pthread_cond_signal | |
85 | #pragma weak pthread_cond_wait | |
86 | #pragma weak pthread_exit | |
87 | #pragma weak pthread_mutex_destroy | |
88 | #pragma weak pthread_self | |
89 | #ifdef _POSIX_PRIORITY_SCHEDULING | |
90 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING | |
91 | #pragma weak sched_get_priority_max | |
92 | #pragma weak sched_get_priority_min | |
93 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ | |
94 | #endif /* _POSIX_PRIORITY_SCHEDULING */ | |
95 | #pragma weak sched_yield | |
96 | #pragma weak pthread_attr_destroy | |
97 | #pragma weak pthread_attr_init | |
98 | #pragma weak pthread_attr_setdetachstate | |
99 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING | |
100 | #pragma weak pthread_getschedparam | |
101 | #pragma weak pthread_setschedparam | |
102 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ | |
103 | #endif /* _LIBOBJC || _LIBOBJC_WEAK */ | |
104 | ||
105 | static inline int | |
106 | __gthread_active_p (void) | |
107 | { | |
108 | static void *const __gthread_active_ptr | |
658acbb2 | 109 | = __extension__ (void *) &pthread_cancel; |
18167442 EB |
110 | return __gthread_active_ptr != 0; |
111 | } | |
112 | ||
113 | #else /* not SUPPORTS_WEAK */ | |
114 | ||
115 | static inline int | |
116 | __gthread_active_p (void) | |
117 | { | |
118 | return 1; | |
119 | } | |
120 | ||
121 | #endif /* SUPPORTS_WEAK */ | |
122 | ||
123 | #ifdef _LIBOBJC | |
124 | ||
125 | /* This is the config.h file in libobjc/ */ | |
126 | #include <config.h> | |
127 | ||
128 | #ifdef HAVE_SCHED_H | |
129 | # include <sched.h> | |
130 | #endif | |
131 | ||
132 | /* Key structure for maintaining thread specific storage */ | |
133 | static pthread_key_t _objc_thread_storage; | |
134 | static pthread_attr_t _objc_thread_attribs; | |
135 | ||
136 | /* Thread local storage for a single thread */ | |
137 | static void *thread_local_storage = NULL; | |
138 | ||
139 | /* Backend initialization functions */ | |
140 | ||
141 | /* Initialize the threads subsystem. */ | |
142 | static inline int | |
143 | __gthread_objc_init_thread_system (void) | |
144 | { | |
145 | if (__gthread_active_p ()) | |
146 | { | |
147 | /* Initialize the thread storage key. */ | |
148 | if (pthread_key_create (&_objc_thread_storage, NULL) == 0) | |
149 | { | |
150 | /* The normal default detach state for threads is | |
151 | * PTHREAD_CREATE_JOINABLE which causes threads to not die | |
152 | * when you think they should. */ | |
153 | if (pthread_attr_init (&_objc_thread_attribs) == 0 | |
154 | && pthread_attr_setdetachstate (&_objc_thread_attribs, | |
155 | PTHREAD_CREATE_DETACHED) == 0) | |
156 | return 0; | |
157 | } | |
158 | } | |
159 | ||
160 | return -1; | |
161 | } | |
162 | ||
163 | /* Close the threads subsystem. */ | |
164 | static inline int | |
165 | __gthread_objc_close_thread_system (void) | |
166 | { | |
167 | if (__gthread_active_p () | |
168 | && pthread_key_delete (_objc_thread_storage) == 0 | |
169 | && pthread_attr_destroy (&_objc_thread_attribs) == 0) | |
170 | return 0; | |
171 | ||
172 | return -1; | |
173 | } | |
174 | ||
175 | /* Backend thread functions */ | |
176 | ||
177 | /* Create a new thread of execution. */ | |
178 | static inline objc_thread_t | |
179 | __gthread_objc_thread_detach (void (*func)(void *), void *arg) | |
180 | { | |
181 | objc_thread_t thread_id; | |
182 | pthread_t new_thread_handle; | |
183 | ||
184 | if (!__gthread_active_p ()) | |
185 | return NULL; | |
186 | ||
187 | if (!(pthread_create (&new_thread_handle, NULL, (void *) func, arg))) | |
188 | thread_id = (objc_thread_t) new_thread_handle; | |
189 | else | |
190 | thread_id = NULL; | |
191 | ||
192 | return thread_id; | |
193 | } | |
194 | ||
195 | /* Set the current thread's priority. */ | |
196 | static inline int | |
197 | __gthread_objc_thread_set_priority (int priority) | |
198 | { | |
199 | if (!__gthread_active_p ()) | |
200 | return -1; | |
201 | else | |
202 | { | |
203 | #ifdef _POSIX_PRIORITY_SCHEDULING | |
204 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING | |
205 | pthread_t thread_id = pthread_self (); | |
206 | int policy; | |
207 | struct sched_param params; | |
208 | int priority_min, priority_max; | |
209 | ||
210 | if (pthread_getschedparam (thread_id, &policy, ¶ms) == 0) | |
211 | { | |
212 | if ((priority_max = sched_get_priority_max (policy)) == -1) | |
213 | return -1; | |
214 | ||
215 | if ((priority_min = sched_get_priority_min (policy)) == -1) | |
216 | return -1; | |
217 | ||
218 | if (priority > priority_max) | |
219 | priority = priority_max; | |
220 | else if (priority < priority_min) | |
221 | priority = priority_min; | |
222 | params.sched_priority = priority; | |
223 | ||
224 | /* | |
225 | * The solaris 7 and several other man pages incorrectly state that | |
226 | * this should be a pointer to policy but pthread.h is universally | |
227 | * at odds with this. | |
228 | */ | |
229 | if (pthread_setschedparam (thread_id, policy, ¶ms) == 0) | |
230 | return 0; | |
231 | } | |
232 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ | |
233 | #endif /* _POSIX_PRIORITY_SCHEDULING */ | |
234 | return -1; | |
235 | } | |
236 | } | |
237 | ||
238 | /* Return the current thread's priority. */ | |
239 | static inline int | |
240 | __gthread_objc_thread_get_priority (void) | |
241 | { | |
242 | #ifdef _POSIX_PRIORITY_SCHEDULING | |
243 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING | |
244 | if (__gthread_active_p ()) | |
245 | { | |
246 | int policy; | |
247 | struct sched_param params; | |
248 | ||
249 | if (pthread_getschedparam (pthread_self (), &policy, ¶ms) == 0) | |
250 | return params.sched_priority; | |
251 | else | |
252 | return -1; | |
253 | } | |
254 | else | |
255 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ | |
256 | #endif /* _POSIX_PRIORITY_SCHEDULING */ | |
257 | return OBJC_THREAD_INTERACTIVE_PRIORITY; | |
258 | } | |
259 | ||
260 | /* Yield our process time to another thread. */ | |
261 | static inline void | |
262 | __gthread_objc_thread_yield (void) | |
263 | { | |
264 | if (__gthread_active_p ()) | |
265 | sched_yield (); | |
266 | } | |
267 | ||
268 | /* Terminate the current thread. */ | |
269 | static inline int | |
270 | __gthread_objc_thread_exit (void) | |
271 | { | |
272 | if (__gthread_active_p ()) | |
273 | /* exit the thread */ | |
274 | pthread_exit (&__objc_thread_exit_status); | |
275 | ||
276 | /* Failed if we reached here */ | |
277 | return -1; | |
278 | } | |
279 | ||
280 | /* Returns an integer value which uniquely describes a thread. */ | |
281 | static inline objc_thread_t | |
282 | __gthread_objc_thread_id (void) | |
283 | { | |
284 | if (__gthread_active_p ()) | |
285 | return (objc_thread_t) pthread_self (); | |
286 | else | |
287 | return (objc_thread_t) 1; | |
288 | } | |
289 | ||
290 | /* Sets the thread's local storage pointer. */ | |
291 | static inline int | |
292 | __gthread_objc_thread_set_data (void *value) | |
293 | { | |
294 | if (__gthread_active_p ()) | |
295 | return pthread_setspecific (_objc_thread_storage, value); | |
296 | else | |
297 | { | |
298 | thread_local_storage = value; | |
299 | return 0; | |
300 | } | |
301 | } | |
302 | ||
303 | /* Returns the thread's local storage pointer. */ | |
304 | static inline void * | |
305 | __gthread_objc_thread_get_data (void) | |
306 | { | |
307 | if (__gthread_active_p ()) | |
308 | return pthread_getspecific (_objc_thread_storage); | |
309 | else | |
310 | return thread_local_storage; | |
311 | } | |
312 | ||
313 | /* Backend mutex functions */ | |
314 | ||
315 | /* Allocate a mutex. */ | |
316 | static inline int | |
317 | __gthread_objc_mutex_allocate (objc_mutex_t mutex) | |
318 | { | |
319 | if (__gthread_active_p ()) | |
320 | { | |
321 | mutex->backend = objc_malloc (sizeof (pthread_mutex_t)); | |
322 | ||
323 | if (pthread_mutex_init ((pthread_mutex_t *) mutex->backend, NULL)) | |
324 | { | |
325 | objc_free (mutex->backend); | |
326 | mutex->backend = NULL; | |
327 | return -1; | |
328 | } | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | /* Deallocate a mutex. */ | |
335 | static inline int | |
336 | __gthread_objc_mutex_deallocate (objc_mutex_t mutex) | |
337 | { | |
338 | if (__gthread_active_p ()) | |
339 | { | |
340 | int count; | |
341 | ||
342 | /* | |
343 | * Posix Threads specifically require that the thread be unlocked | |
344 | * for pthread_mutex_destroy to work. | |
345 | */ | |
346 | ||
347 | do | |
348 | { | |
349 | count = pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend); | |
350 | if (count < 0) | |
351 | return -1; | |
352 | } | |
353 | while (count); | |
354 | ||
355 | if (pthread_mutex_destroy ((pthread_mutex_t *) mutex->backend)) | |
356 | return -1; | |
357 | ||
358 | objc_free (mutex->backend); | |
359 | mutex->backend = NULL; | |
360 | } | |
361 | return 0; | |
362 | } | |
363 | ||
364 | /* Grab a lock on a mutex. */ | |
365 | static inline int | |
366 | __gthread_objc_mutex_lock (objc_mutex_t mutex) | |
367 | { | |
368 | if (__gthread_active_p () | |
369 | && pthread_mutex_lock ((pthread_mutex_t *) mutex->backend) != 0) | |
370 | { | |
371 | return -1; | |
372 | } | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | /* Try to grab a lock on a mutex. */ | |
378 | static inline int | |
379 | __gthread_objc_mutex_trylock (objc_mutex_t mutex) | |
380 | { | |
381 | if (__gthread_active_p () | |
382 | && pthread_mutex_trylock ((pthread_mutex_t *) mutex->backend) != 0) | |
383 | { | |
384 | return -1; | |
385 | } | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | /* Unlock the mutex */ | |
391 | static inline int | |
392 | __gthread_objc_mutex_unlock (objc_mutex_t mutex) | |
393 | { | |
394 | if (__gthread_active_p () | |
395 | && pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend) != 0) | |
396 | { | |
397 | return -1; | |
398 | } | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /* Backend condition mutex functions */ | |
404 | ||
405 | /* Allocate a condition. */ | |
406 | static inline int | |
407 | __gthread_objc_condition_allocate (objc_condition_t condition) | |
408 | { | |
409 | if (__gthread_active_p ()) | |
410 | { | |
411 | condition->backend = objc_malloc (sizeof (pthread_cond_t)); | |
412 | ||
413 | if (pthread_cond_init ((pthread_cond_t *) condition->backend, NULL)) | |
414 | { | |
415 | objc_free (condition->backend); | |
416 | condition->backend = NULL; | |
417 | return -1; | |
418 | } | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /* Deallocate a condition. */ | |
425 | static inline int | |
426 | __gthread_objc_condition_deallocate (objc_condition_t condition) | |
427 | { | |
428 | if (__gthread_active_p ()) | |
429 | { | |
430 | if (pthread_cond_destroy ((pthread_cond_t *) condition->backend)) | |
431 | return -1; | |
432 | ||
433 | objc_free (condition->backend); | |
434 | condition->backend = NULL; | |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
439 | /* Wait on the condition */ | |
440 | static inline int | |
441 | __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) | |
442 | { | |
443 | if (__gthread_active_p ()) | |
444 | return pthread_cond_wait ((pthread_cond_t *) condition->backend, | |
445 | (pthread_mutex_t *) mutex->backend); | |
446 | else | |
447 | return 0; | |
448 | } | |
449 | ||
450 | /* Wake up all threads waiting on this condition. */ | |
451 | static inline int | |
452 | __gthread_objc_condition_broadcast (objc_condition_t condition) | |
453 | { | |
454 | if (__gthread_active_p ()) | |
455 | return pthread_cond_broadcast ((pthread_cond_t *) condition->backend); | |
456 | else | |
457 | return 0; | |
458 | } | |
459 | ||
460 | /* Wake up one thread waiting on this condition. */ | |
461 | static inline int | |
462 | __gthread_objc_condition_signal (objc_condition_t condition) | |
463 | { | |
464 | if (__gthread_active_p ()) | |
465 | return pthread_cond_signal ((pthread_cond_t *) condition->backend); | |
466 | else | |
467 | return 0; | |
468 | } | |
469 | ||
470 | #else /* _LIBOBJC */ | |
471 | ||
472 | static inline int | |
473 | __gthread_once (__gthread_once_t *once, void (*func) (void)) | |
474 | { | |
475 | if (__gthread_active_p ()) | |
476 | return pthread_once (once, func); | |
477 | else | |
478 | return -1; | |
479 | } | |
480 | ||
481 | static inline int | |
482 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) | |
483 | { | |
484 | return pthread_key_create (key, dtor); | |
485 | } | |
486 | ||
487 | static inline int | |
488 | __gthread_key_delete (__gthread_key_t key) | |
489 | { | |
490 | return pthread_key_delete (key); | |
491 | } | |
492 | ||
493 | static inline void * | |
494 | __gthread_getspecific (__gthread_key_t key) | |
495 | { | |
496 | return pthread_getspecific (key); | |
497 | } | |
498 | ||
499 | static inline int | |
500 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
501 | { | |
502 | return pthread_setspecific (key, ptr); | |
503 | } | |
504 | ||
505 | static inline int | |
506 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
507 | { | |
508 | if (__gthread_active_p ()) | |
509 | return pthread_mutex_lock (mutex); | |
510 | else | |
511 | return 0; | |
512 | } | |
513 | ||
514 | static inline int | |
515 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
516 | { | |
517 | if (__gthread_active_p ()) | |
518 | return pthread_mutex_trylock (mutex); | |
519 | else | |
520 | return 0; | |
521 | } | |
522 | ||
523 | static inline int | |
524 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
525 | { | |
526 | if (__gthread_active_p ()) | |
527 | return pthread_mutex_unlock (mutex); | |
528 | else | |
529 | return 0; | |
530 | } | |
531 | ||
532 | static inline int | |
533 | __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) | |
534 | { | |
535 | mutex->depth = 0; | |
536 | mutex->owner = (pthread_t) 0; | |
537 | return pthread_mutex_init (&mutex->actual, NULL); | |
538 | } | |
539 | ||
540 | static inline int | |
541 | __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) | |
542 | { | |
543 | if (__gthread_active_p ()) | |
544 | { | |
545 | pthread_t me = pthread_self (); | |
546 | ||
547 | if (mutex->owner != me) | |
548 | { | |
549 | pthread_mutex_lock (&mutex->actual); | |
550 | mutex->owner = me; | |
551 | } | |
552 | ||
553 | mutex->depth++; | |
554 | } | |
555 | return 0; | |
556 | } | |
557 | ||
558 | static inline int | |
559 | __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) | |
560 | { | |
561 | if (__gthread_active_p ()) | |
562 | { | |
563 | pthread_t me = pthread_self (); | |
564 | ||
565 | if (mutex->owner != me) | |
566 | { | |
567 | if (pthread_mutex_trylock (&mutex->actual)) | |
568 | return 1; | |
569 | mutex->owner = me; | |
570 | } | |
571 | ||
572 | mutex->depth++; | |
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static inline int | |
578 | __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) | |
579 | { | |
580 | if (__gthread_active_p ()) | |
581 | { | |
582 | if (--mutex->depth == 0) | |
e2e9b7b8 | 583 | { |
18167442 EB |
584 | mutex->owner = (pthread_t) 0; |
585 | pthread_mutex_unlock (&mutex->actual); | |
586 | } | |
587 | } | |
588 | return 0; | |
589 | } | |
590 | ||
591 | #endif /* _LIBOBJC */ | |
592 | ||
593 | #endif /* ! GCC_GTHR_POSIX_H */ |